System of control.



I Patented Feb. 17, 1914.

YI ZTNESSES .5 15 AT Taxis/By.

. when used as a motor,

'paratus used in the UNITED sTATns PATENT ormon LUDWIG DREYFUS, OF NIEDER-$CH6NHAUSEN, GERMANY, ASSIGNOB TO GENERAL ELECTRIC COMPANY, CORPORATION OF NEW YORK.

SYs'rEM or common.

Specification of Letters Patent. Patented Feb 17, 1914.

Application filed July 18, 1912,. Serial No. 710,141.

ing at Nieder-Schonhausen, Germany, have invented certain new anduseful Improvements in Systems of Control, of whichthe following is a specification.

My invention relates to a system ofcontrol of alternating current dynamo electric machines and particularly to the control of such machines in which both members are supplied with alternating current. In a shunt dynamo electric machine of this class, the winding on the stationary or field member is connected to an alternating current source of supply and the rotating member or armature is provided with a commutator and brushes, current being supplied to the latter from the same alternating current source. It is .well known that the speed of such a dynamo electric machine, when operating as a motor, or the operating as a generator, may be varied by varying the voltage impressed on the stationary or rotating members; but with such a variation in voltage, a change occurs in the phase relation of the currents in the two members. For motor operation, the voltage impressed on the rotatingmember, and for generator operation, the voltage generated in the rotating member, should be substantially in phase with the voltage induced therein by the resultant field.

My invention has for its object a new and improved control system for such dynamo electric machlnes by which the voltage 1m pressed on the armature winding may be varied but will always remain substantially in phase with the voltage induced in the armature by the resultant field.

To this end my invention consists in certain features of novelty which will be pointed oht with particularity in the claims annexed to and forming a part of this specification.

F or a better understanding of my inventi n, reference may be had to the following description taken in connection with the accompanying drawing, in which- Figure 1 shows diagrammatically a control system for a three phase comn'iutator motor in accordance with my invention; and Fig. 2 is a view of the arrangement of apsystem of Fig. 1.

R eferring to the drawing, A is the stator winding of a three phase commutator motor, and B is the rotary member or armature provided with a commutator C on which brushes D hear. .The brushes D may be shifted in any well-known manner, as by a handle E on brush yoke F. If the speed of the-motor is to be varied, the brushes D are shifted simultaneously with a variation of the value of thearmature voltage, the phase of which is shifted relatively to the voltage impressed upon the stator winding so as to be substantially in phase with the'armature reaction, or in other words, the voltage induced in the rotating member by the resultant field. Preferably, this is accomplished. by means of an induction regulator Gr, mechanically connected to the brush yoke F.

In the particular arrangement shown in the drawing, the phases of the stator winding A are connected in star at 0. g, g, g are the phases of the primary winding of-the induction regulator also connected in star at O, and s, s, s are the phases of the secondary winding of the induction regulator. The primary phases g, 9,9 of the regulator are connected in parallel with the phases of the stator winding, and these two sets of windings are connected to mains L, L, L through switches T, T, T. The secondary winding of the regulator is connected to portionsof the stator winding and the free ends thereof are connected to the brushes D of the armature. The voltages impressed on the a rmature are represented in the drawing by the vectors V and are composed of the partial voltages 0-1 of the stator winding and the secondary voltages 1 2 of the induction regulator. The phase of the secondary voltages is indicated in the drawing by the angle e, which is the angle between the voltages of the stator winding and the secondary winding of the induct-ion regulator.

I shall describe my invention in connection with a particular ratio of the partial voltages O-1 and the secondary voltages 1-2 of the regulator, but it is obvious that other ratios may be chosen. I have selected tap points 1 on the stator winding so that the secondary voltage 1-2 of the regulator equals the partial voltage 0-1 of the stator winding, then the voltage V which is impressed upon the rotor is displaced with relationto the stator voltage by the angle qa/Q.

The voltage impressed upon the rotary memr I, with a ratio of transmission of and tie uiternu'ing' our dynamo ic machine and the indut ion 1' gulut-or the same number of poles, then by disesecondary 0:15 the induction regucorresponding c i let brush position is SiE'HUiHHOOUSiY obtained. For convenieiice 'i have shown the brush yoke grohandie E for simultaneously 1 the induction reguiutor and U F, but the regulator may e vith a handle if desired.

dntoi? and the dynamo electric I unlike numbers of pole", the of transmission of the HQ H is o *d by multiplying the ratio oi. the pole by 1/2. The ratio of tr; iisinission '3 SOZDQ'Wiifib varied it, at every step, it to impress on the rotary member a subetuutiuiiy in phase with the arms reaction with a slight variation caused j 113.50 cm'npeiuiation i suii'iably selectfne ii'uig'nitudes of voiuges G-1 and "Quint-i011 of the phase compensation Iii steps may be obtained. I is no necessary that the 'voitege ()--'i to cd i 1-2 of the secondary of added, should be. hen from x W iding, but it may be oh '1 1 eti known manner, and I desire it to be to-" d that I. aim to cover in the ap- I as this or any other modification 1 does not in; live a departure from the s ri.t ind scope oi. my invention.

' at it hn us new and desire to secure or: tent oi". the United tqtes, is,-

binution, an siterneting our tent ectric E11 chine timing a stator mg and an armature, said ernmtroie ben-ovided with u conunututor and brushes, means ;or serving the value of. the a mature voltage and shifting its phase retetiveiy to the voltage impressed upon the 1 Mel in regu alter and the POSiUOIL; given g h i 4, L J. flushes L. if the pot-ennui LGgMiZLLOI e brush yoke F are mechanically ,eu, H .er, as by means of gear 1119; said and means for Sillf mien of:

stator windin t neousiy with the van :37 brushes s1 niult i on. ulteriiit dynamo electric machine hem u s not" 'hg; and an armature, said ttllnt tut-e be ing' provided with comn'iutetor and brushes, 3. brush yokefor said iiirushes, and. means including an induction reguiutor I" ch niesiiy connected to said .nusb. yoke for i 'aryiiut the vuiue of armature voltage and s1 ting its phase zitiveiy to the mite impressed upon the stator combination, a: eh

emittin current dynamo e ectric machine h wing :1v stationary member provided with u poiyphuse winding, and armzitu e, said urn'uiture being provided with e poiyphuse Winding, u C("lliiltii'il" tor and brusi'ies means for shift-inf brushes, and an induction regulator i at secondary winding, said sccon hiry of the reguhitor being; connected to ou tions of the Winding on said stationery member and to said brushes.

5. In combinutioi, 11.11 alternating ci'urcnt dynamo eiect-ri c lllfLCiliD e h :1 vi n g a s t :iti onury member provided with s poiyphune winding, and (n armature, said. :irinuture being; provided with :i, poiyphese Winding, u coininutator and brushes, :1 brush yoke for said brushes, and on. induction regulator inechunically connected to said brush yoke, said induction regulator u second winding connected to portions of the \vinuing on said stutioimry inembe und to said brushes.

Witness whereof, I have hereunto set my hand this 27th day of June, 1912. 

